Searching for a room in Bonn! From October

Hi,
I'm a 24 years old italian student coming from Rome to Bonn for 1 year to study in Unibonn. I speak German, Portuguese, Spanish and English, I like to meet new people, travel, cooking and listen to music. I've been in Erasmus in Lisbon two years ago for one year and I really enjoyed it.
I'll be in Bonn to attend a master degree in Languages and I'm searching for a Room!
I don't care about room size, I don't have any preferencies about flatmates or house rules, I just need a place to stay :) I'm not spoiled, I'm a sociable, tidy and respectful person.
It's better if the apartment is close to University, but it could be also good it's possible to reach it in 15/20 minutes by bus or bike.
I can pay an amount between 300/400 €
Hope you can help me out!
Thank you! :)
Valerio